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toluene and ethylbenzene concentrations were 81 mg/kg and 45 mg/kg, respectively, in the 20 feet sample from MW-2 The highest xylenes 1� concentration was 230 mg/kg 1n the 15 feet sample from PH-1 Soil sample results are summarized in Table 2 and illustrated in Figure 6 Acculabs analytical reports are contained in Appendix B BTEX concentrations in soil samples collected at or below the groundwater table were relatively higher than those obtained above The highest BTEX concentrations were measured in the 35 feet soil sample from PH-1 at 15 mg/kg, 100 mg/kg, 46 mg/kg and 220 mg/kg, respectively PSC suggests that BTEX concentrations measured in soil samples collected below the igroundwater table are a result of the contaminated groundwater present within their matrix In contrast, TPHg concentrations in soil samples collected above the groundwater table are generally higher than those obtained below TPHg was measured at 2,400 mg/kg in the 15 feet sample from PH-1, 4,100 mg/kg in the 10 feet sample from PH-2, and 1,200 mg/kg in the 20 feet sample from MW-2 It is evident that BTEX compounds, once potentially present in these higher TPHg samples, have significantly degraded BTEX and TPHg concentrations were not detected in the soil samples collected above the water table from the perimeter PH-3, PH-4 and PH-5 probeholes This data suggests that the lateral extent of BTEX and TPHg impact is narrowly confined in the vicinity of the former UST The vertical extent of any BTEX or TPHg impact is evaluated to be 50 to 55 feet The 55 feet sample from probehole PH-3 contained non-detectable concentrations of petroleum hydrocarbons ttOxygenate compounds di-isopropyl ether(DIPE), ethyl tertiary butyl ether �� 1 (ETBE), methyl t-butyl ether (MTBE), tertiary amyl methyl ether (TAME) �p and tertiary butyl alcohol (TBA) have not been detected in any soil sample 3.3 Groundwater Conditions As shown in Table 3 and illustrated in Figure 6, BTEX and TPHg ' concentrations in groundwater samples collected in March of 2002 were relatively high at the MW-2 location BTEX concentrations in the MW-2 groundwater sample were measured at 16,000 micrograms per liter(ug/1), 38,000 ug/l, 6,400 ug/l, and 35,000 ug/l, respectively The TPHg concentration in the MW-2 sample was measured at 75,000 ug/l These MW-2 sample results are relatively consistent with historic results 12 March 2002 Subsurface Site Investigation 1717 South Center Street-Stockton,California Prepared by Philip Services Corp H TNW24001321121382EG\Prujxts4StnckCcniVnarcit2002imeuigation dM May 14 2007